A child runs at 3.0 m/s and jumps onto a sled, initially at rest. If the child's mass is 36 kg, and if the child and sled slide off together at 2.0 m/s after the collision, the sled's mass is
A. 48 kg.
B. 18 kg.
C. 12 kg.
D. 36 kg.
Answer: B
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Two extremely large nonconducting horizontal sheets each carry uniform charge density on the surfaces facing each other
The upper sheet carries +5.00 µC/m2. The electric field midway between the sheets is 4.25 × 105 N/C pointing downward. What is the surface charge density on the lower sheet? (?0 = 8.85 × 10-12 C2/N ? m2) What will be an ideal response?
Which of the following models best explains why our galaxy has spiral arms?
A) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy. B) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. C) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. D) The spiral arms are a wave of star formation caused by wave of density propagating outward through the disk of the galaxy.
A Type I supernova is believed to occur when
a. the core of a massive star collapses. b. hydrogen detonation occurs. c. a white dwarf exceeds the Chandrasekhar limit. d. the cores of massive stars collapse. e. neutrinos in a massive star become degenerate and form a shock wave that explodes the star.
The Phanerozoic eon and the Paleozoic era began about ______________ million years ago
Fill in the blank(s) with correct word